<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		*{
			margin: 0px;
			padding: 0px;
		}
		li{
			list-style: none;
		}
		li{
			width: 150px;
			height: 35px;
			text-align: center;
			line-height: 35px;
			color: #fff;
			background: #222223 url() 0 0 no-repeat;
			float: left;
			cursor: pointer;
		}
		li:hover{
			background: #000 url() 0 0 no-repeat;
		}
		/*.son_item{
			width: 150px;
			height: 35px;
			text-align: center;
			line-height: 35px;
			color: #fff;
			background: #222223 url() 0 0 no-repeat;
			cursor: pointer;
		}*/
		.son{
			display: none;
		}
	</style>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
	<script>
		
		$(function () {
			
			$('.father_item').hover(function() {
				$(this).children('.son').show();
			}, function() {
				$(this).children('.son').hide();
			});
		})
	</script>
</head>
<body>
	<ul class="father">
		<li class="father_item">菜单1
			<ul class="son">
				<li class="son_item">菜单01</li>
				<li class="son_item">菜单02</li>
				<li class="son_item">菜单03</li>
				<li class="son_item">菜单04</li>
				<li class="son_item">菜单05</li>
			</ul>
		</li>
		<li class="father_item">菜单2
			<ul class="son">
				<li class="son_item">菜单01</li>
				<li class="son_item">菜单02</li>
				<li class="son_item">菜单03</li>
				<li class="son_item">菜单04</li>
				<li class="son_item">菜单05</li>
				<li class="son_item">菜单06</li>
				<li class="son_item">菜单07</li>
			</ul>
		</li>
		<li class="father_item">菜单3
			<ul class="son">
				<li class="son_item">菜单01</li>
				<li class="son_item">菜单02</li>
				<li class="son_item">菜单03</li>
				<li class="son_item">菜单04</li>
				<li class="son_item">菜单05</li>
				<li class="son_item">菜单06</li>
				<li class="son_item">菜单07</li>
				<li class="son_item">菜单08</li>
				<li class="son_item">菜单09</li>
			</ul>
		</li>
		<li class="father_item">菜单4
			<ul class="son">
				<li class="son_item">菜单01</li>
				<li class="son_item">菜单02</li>
				<li class="son_item">菜单03</li>
				<li class="son_item">菜单04</li>
			</ul>
		</li>
	</ul>
</body>
</html>